[Live-demo] compressing images with pngquant

Johan Van de Wauw johan.vandewauw at gmail.com
Fri Jun 5 12:25:32 PDT 2015

On Thu, Jun 4, 2015 at 8:33 PM, Johan Van de Wauw
<johan.vandewauw at gmail.com> wrote:
> Hi all,
> I've been experimenting with pngquant [1] to reduce the size of our
> png images in the documentation. This implements a lossy compression
> method, but all images I tried came out just fine.
> In total, we could save about 36Mb by using this compression on all
> files. I believe this is significant enough to do the change for most
> files, especially since they are accessed also over the web by people
> reading the quickstart.
> I prepared a branch which contains the compressed images at:
> https://github.com/johanvdw/OSGeoLive-doc/tree/compresspng
> I made a single commit per image, so if we merge we can still roll
> back specific images easily.
> In fact, on github, you can watch the images side by side or as a slide over.

During the meeting last night I proposed fixing only those images
where the difference was most significant (>50% reduction in size and
files of at least 32Kb).
The results are here:
The result can be downloaded as a package from:
And it can be previewed at:

In total we save some 34 Mb, most of which is preserved when
compressing the files.

Since I did not see any image which is not good I propose to merge this.

Kind Regards,

More information about the Osgeolive mailing list